Status and Events
Read the Event Q
ueue with the EVENT? query (which returns only the event
number), with the EVMSG? query (which returns the event number and a text
description of the event), or with the ALLEV? query (which returns all the event
numbers along with a description o f the event). Reading an event removes it
from the queue.
Before reading an event from the Event Queue, you must use the *ESR? query to
read the summary of the event from the SESR. This makes the events summarized
by the *ESR? read available to the EVENT? and EVMSG? queries, and empties
the SESR.
Reading the SESR erases any events that were summarized by previous *ESR?
reads but
not read from the Event Queue. Events that follow an *ESR? read are
put in the Event Queue but are not available until *ESR? is u sed again.
Event Handling Sequence
The figure below shows h ow to use the status and event handling system. In the
explanation that follows, numbers in parentheses refer to numbers in the figure.
MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual 3-5
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